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    Rewterz Threat Alert – Reductor Infects Files on the Fly to Compromise TLS Traffic

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    March 25, 2023
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    Rewterz Threat Alert – GandCrab or .CRAB Ransomware – Active IOCs
    Severity Medium Analysis Summary GandCrab – a ransomware-as-a-service variant – was discovered in early 2018. At least five versions of GandCrab have been created since its […]
    March 25, 2023
    March 25, 2023
    Rewterz Threat Alert – NJRAT – Active IOCs
    Severity Medium Analysis Summary NjRat is a Remote Access Trojan, which is found leveraging Pastebin to deliver a second-stage payload after initial infection. There are multiple […]
    March 24, 2023
    March 24, 2023
    Rewterz Threat Advisory – CVE-2023-20113 – Cisco SD-WAN vManage Software Vulnerability
    Severity Medium Analysis Summary CVE-2023-20113  Cisco SD-WAN vManage Software is vulnerable to cross-site request forgery, caused by improper validation of user-supplied input. By persuading an authenticated […]

    Threat Insights

    16
    pdf-file (1)
    Annual Threat Intelligence Report 2022
    • Threat Advisories
    • Monthly Threat Insights
    • Threat Intelligence Reports
  • Why Rewterz?

    About Us

    Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.

    Read More

    play_btn_Smallplay_btn_hover_Small
    leadership

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    Our leadership team brings together years of knowledge and experience in cybersecurity to drive our company's mission and vision. Our team is passionate about delivering high-quality products and services, leading by example and assisting our clients in securing their organization’s environment.
    help

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    At Rewterz, we believe that businesses have a responsibility to impact positively and contribute to the well-being of our communities as well as the planet. That's why we are committed to operating in a socially responsible and sustainable way.

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Rewterz Threat Alert – Reductor Infects Files on the Fly to Compromise TLS Traffic

October 4, 2019

Severity

Medium

Analysis Summary

Besides typical RAT functions such as uploading, downloading and executing files, Reductor’s authors put a lot of effort into manipulating digital certificates and marking outbound TLS traffic with unique host-related identifiers. Reductor has been linked to Turla APT, based on the victimology. Reductor spreads by either infecting popular software distributions (Internet Downloader Manager, WinRAR, etc. and, for at least one victim, through a popular warez website over HTTP); or its decryptor/dropper is spread using COMpfun’s ability to download files on already infected hosts.

The malware adds digital certificates from its data section to the target host and allows the operators to add additional certificates remotely through a named pipe. The solution that Reductor’s developers found to mark TLS traffic is the most ingenious part. They don’t touch the network packets at all; instead developers analyzed the Firefox source code and Chrome binary code to patch the corresponding pseudo random number generation (PRNG) functions in the process’s memory.

In the first scenario, the attackers use infected software installers with 32- and 64-bit versions of Reductor included. These installers may be for popular Internet Download Manager, Office Activator, etc. In the second scenario, the targets are already infected with the COMpfun Trojan, which uses COM CLSID for persistence. After getting into the browser’s address space, the Trojan can receive the command to download additional modules from the C2. As a result, the target’s browser downloaded Reductor’s custom dropper-decryptor.
Reductor samples hold DER-encoded root X509v3 certificates in the .data section to add on the target hosts.

Impact

Data Manipulation

Indicators of Compromise

IP(s) / Hostname(s)

  • compfun[.]net
  • adstat[.]pw
  • bill-tat[.]pw

Malware Hash (MD5/SHA1/SH256)

  • 7911F8D717DC9D7A78D99E687A12D7AD
  • 4e2d038e9d72ee4d660755ba973a31471dda167d1a51bfdfe60abb2b3de78ba1
  • e49666f7882f299c2845c7e31e3d842a387ef10d

Remediation

  • Block the threat indicators at their respective controls.
  • Keep software like IDM and WinRAR updated to the latest patched versions.
  • Do not download software from untrusted sources.

Platform

  • Rewterz XDR
  • Rewterz Defense
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Managed Security Services

  • Managed Security Monitoring
  • Remote SOC
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Assess

  • Compromise Assessment
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  • Red Team Assessment
  • Purple Team Assessment
  • Social Engineering
  • Source Code Review

Transform

  • SOC Consultancy
  • SOC Maturity Assessment
  • SOC Model Evaluation
  • SOC Gap Analysis
  • SIEM Gap Analysis
  • SIEM Optimization
  • SOC Content Pack

Train

  • Simulated Cyber Attack Exercise
  • Tabletop Exercise
  • Security Awareness and Training

Respond

  • Incident Analysis
  • Incident Response

Threat Insights

  • Threat Advisories
  • Monthly Threat Insights
  • Threat Intelligence Reports

Resources

  • Blog
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Connect With Us

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